Akasofu能量耦合函数的数值检验

从太阳风-磁层能量耦合的普遍表达式出发,用34天连续的太阳风观测资料对电磁耦合机制进行了数值检验.结果表明,只有当行星际磁场有南向分量的时候,电磁耦合机制才能近似表示太阳风-磁层能量耦合过程.此时,能量输入率可以表示成p=CB_T2/3V5/3n1/3sin4（θ/2）这个函数与Akasofu能量耦合函数ε=VB2l₀2sin4（θ/2）有一定差别,但与Murayama和Hakamada,Svalgaard,Holzer和Slavin等人的结果一致.本文对影响能量耦合函数计算的几个问题从原始资料、处理方法及物理机制上进行了讨论. 

Numerical Examination of Akasofu's Energy Coupling Function

Based on the general formula of the energy transfer rate from the solar wind into the magnetosphere, the coupling mechanism of MHD flow is examined by using solar wind data for a period, of 34 days. It is shown that MHD flow mechanism is valid when B_z<0 (or IMF is southward). In this case the energy transfer rate can be expressed by P =CBT2/3V5/3n1/3sin4((3/2). This is dfferent from Akasofu's coupling function, but in good agreement with Murayama & Hakamada, Svalgaard, Murayama, and Holzer & Slavin. The factors influencing the calculations of coupling function are also discussed.